Hi Mala, I'm sorry I'm still not really understanding what you're trying to do but I will keep looking at it.

re:
> What irritates me a little, beyond the actual problem of profile placement at the bending
> points, is that these sweeps don't work...hmmm...

Can you show me a specific sweep that doesn't work?

You've got 12 different profile curves and 4 different rails in your file and it's difficult for me to know which combination in particular is not working.

I tried various ones like this one, works:



Then I tried this one, seems to work:



Tried this one , also seems to work:



- Michael